"My biggest irrational -- hopefully -- fear is that the Zika virus is going to be the solution to overpopulation," she explained.

But wait -- there's more!

"I don't know if you've ever read the Kurt Vonnegut short story where everyone has to take these pills that make your private parts feel like wet sponges and then nobody can have sex and no one can procreate," she continued. "And so by the time I'm older, and I'm like, 'I think I want to be a mother,' they're like, 'You can't. Your private part feels like a sponge.'"

The rest of J.Law's interview is actually quite delightful, as the Passengers star gives adorable answers to her favorite dinner date and her guilty pleasures.

The actress also opens up about her rumored boyfriend, Darren Aronofsky, inside the holiday issue -- calling him a "visionary" -- and says maintaining her privacy a "full-time job."

"You might think you know me, but when you approach me, you're a total stranger to me and I'm scared," she shares.

"I get very protective of my space. It took me a long time to be able to do that. But if I'm eating dinner and somebody comes up and a flash goes off from someone's iPhone camera, I am really rude to that person," she adds. "Then other people at the restaurant will see and be like, 'Oh, damn, I don't want to do that.' Privacy is a full-time job and I work very hard at it."